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I was reading many things about sleep. But I am very curious about knowing why do we sleep. Is it only for trashing out toxic materials or is it anything else?

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    The English Wikipedia entry Sleep has a section Functions of sleep . Could you please edit your question and add, in what way this article does or does not answer your question? en.wikipedia.org/wiki/Sleep?wprov=sfla1 – Arsak Jun 2 '18 at 8:41
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    I'm voting to close this question as off-topic because sleep is a biological function so should be asked on biology.se – Graham Chiu Jun 4 '18 at 3:02